The metal layer (4) is made by metal which murray rigidity is less than 3.
金属层（4）由莫氏硬度为3以下的金属形成。
Surface preparation of metal before chemical process. Removal of a layer of the base metal.
在化学处理之前的表面准备，移除一层金属基材。
There was a layer of silver leaf outside the metal.
金属外边有一层银薄膜。
There was a layer of silver leaf outside the metal.
金属外边有一层银薄膜。
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